Monomer having fluorine-containing acetalor ketal structure, polymer thereof, and chemical-amplification-type resist composition as well as process for formation of pattern with use of the same
申请人:Maeda Katsumi
公开号:US20050164119A1
公开(公告)日:2005-07-28
As a polymer exhibiting improved transparency which is suitable for a resist resin used in a chemical-amplification-type resist being applicable for photolithography using exposure light at 180 nm or shorter, this invention provides a polymer comprising a repeating unit resulting from polymerization of a monomer exhibiting a polymerization activity, wherein the monomer has a fluorine-containing acetal or ketal structure represented by general formula (1):
wherein
R represents an atomic group containing a carbon-carbon double bond exhibiting polymerization activity; at least one of R
1
and R
2
is fluorinated alkyl group or fluorinated aryl group having 1 to 20 carbon atoms; and R
3
represents a radical selected from the group consisting of hydrogen atom, alkyl group, alkoxy-substituted alkyl group, fluorinated alkyl group, aryl group, fluorinated aryl group, aralkyl group and fluorinated aralkyl group having 1 to 20 carbon atoms.
本发明提供了一种透明度改善的聚合物,适用于化学放大型光刻胶中使用的抗性树脂,可用于在180纳米或更短波长的曝光光下进行光刻。该聚合物包括由具有聚合活性的单体聚合得到的重复单元,其中该单体具有由通式(1)表示的含氟缩醛或缩酮结构:
其中,R表示含有聚合活性的碳碳双键的原子基团;R1和R2中至少一个是具有1至20个碳原子的含氟烷基或含氟芳基;R3表示从氢原子、烷基、烷氧基取代的烷基、含氟烷基、芳基、含氟芳基、芳基烷基和含氟芳基烷基等基团中选择的一个基团。